Add screen to API Docker image (#1144)

* Add screen to API Docker image

* Add note about screen dependency

api/Dockerfile

@@ -80,9 +80,15 @@ COPY --from=awf /usr/local/bin/audiowaveform /usr/local/bin
 # - Install system packages needed for running Python dependencies
 #   - libexempi8: required for watermarking
 #   - libpq-dev: required by `psycopg2`
+#   - screen: used for executing long-running commands in production
 # - Create directory for dumping API logs
 RUN apt-get update \
-      && apt-get install -y curl libpq-dev libexempi8 postgresql-client \
+      && apt-get install -y \
+        curl \
+        libpq-dev \
+        libexempi8 \
+        postgresql-client \
+        screen \
       && rm -rf /var/lib/apt/lists/* \
     && mkdir -p /var/log/openverse_api/openverse_api.log